Extreme Networks Px Series manual Session

Persistence Modes

A 64.1.1.7

B www.mybank.com C

E

Client

G

		user=samsmith96754
		D	Server 1
	E	F
		Delivers
		cookie	Database
G	Data	Server 2
	session
			Sam Smith

Server 3

Figure 6-3:Hashed cookie persistence mode

WS_003

Figure 6-3 shows a typical financial website named www.mybank.com. This website has three real servers, each connected to a single backend database system. To minimize time-consuming database “hits,” when a client makes a request of a web server, the web server queries the backend database and caches the client data. In this example, it is critical that the client always access the same web server that contains its cached information. In addition, before accessing the web server, the client must login to the site and obtain a unique cookie.

The following transactions occur in Figure 6-3:

•The website administrator of www.mybank.com sets up each web server (server 1, server 2, and server 3) to create a cookie that contains unique identifying information about each client.

•The website administrator configures the Px series application switch to use hashed cookie persistence mode.

Px Series Application Switch Installation and Configuration Guide 6-9